Penn Electric Switch Co
Penn ElectActive Patents
0
Total Holdings
16
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2570451A | Liquid level control system | Expired / Lapsed | 1948-08-17 | 1951-10-09 | 0 | Details |
| US2385887A | Switch unit | Expired / Lapsed | 1942-06-09 | 1945-10-02 | 0 | Details |
| US2365650A | Water valve | Expired / Lapsed | 1942-09-22 | 1944-12-19 | 0 | Details |
| US2332212A | Thermostat | Expired / Lapsed | 1941-03-05 | 1943-10-19 | 0 | Details |
| US2302250A | Double magnet snap action | Expired / Lapsed | 1941-05-07 | 1942-11-17 | 0 | Details |
| US2269864A | Safety control | Expired / Lapsed | 1939-10-16 | 1942-01-13 | 0 | Details |
| US2262342A | Humidostat | Expired / Lapsed | 1939-05-22 | 1941-11-11 | 0 | Details |
| US2198131A | Humidostat | Expired / Lapsed | 1938-03-07 | 1940-04-23 | 0 | Details |
| US2170341A | Switch unit | Expired / Lapsed | 1938-08-22 | 1939-08-22 | 0 | Details |
| US2136753A | Variable temperature burner control system | Expired / Lapsed | 1936-01-28 | 1938-11-15 | 0 | Details |
| US2111816A | Control switch unit | Expired / Lapsed | 1936-05-25 | 1938-03-22 | 0 | Details |
| US2044397A | Temperature responsive switch | Expired / Lapsed | 1933-10-16 | 1936-06-16 | 0 | Details |
| US2024385A | Heater-cooler thermostat | Expired / Lapsed | 1934-10-29 | 1935-12-17 | 0 | Details |
| US2020618A | Electric control structure | Expired / Lapsed | 1932-09-06 | 1935-11-12 | 0 | Details |
| US1788678A | Controlling device | Expired / Lapsed | 1924-09-02 | 1931-01-13 | 0 | Details |
| US1708309A | Thermal controlling system | Expired / Lapsed | 1924-09-10 | 1929-04-09 | 0 | Details |